Develop Reference

New user is part of a group it was never added to

I'm currently working on an app in which users can create groups and add members to groups. Today I created a new user to test the app. When I logged in this new user I checked to see if it was a part of any groups, which I didn't expect it to be seeing as it was new. And it wasn't. But then when I logged in my usual user and clicked groups I saw the name of the test user. Why does it appear that this user is a part of a group it was never added to?
It should be noted that when looking through my firebase this test user doesn't appear to have been invited either. I'm using firestore recycler adapter to fetch data in a recyclerView.
Below is the code for my adapter responsible for adding members to a specific group.
FirestoreMemberAdapter.java:
public class FirestoreMemberAdapter extends FirestoreRecyclerAdapter<MemberModel, FirestoreMemberAdapter.MemberViewHolder> {
private static final String TAG = FirestoreMemberAdapter.class.getSimpleName();
private Context context;
private String projectId;
private String projectName;
public FirestoreMemberAdapter(#NonNull FirestoreRecyclerOptions<MemberModel> options, Context context, String projectId, String projectName) {
super(options);
this.context = context;
this.projectName = projectName;
this.projectId = projectId;
}
#Override
protected void onBindViewHolder(#NonNull MemberViewHolder holder, int position, #NonNull final MemberModel model) {
holder.mTextView.setText(model.getName());
if (model.getProfile_image() == null) {
Picasso.get().load(R.drawable.profile_image).into(holder.mImageview);
} else {
Picasso.get().load(model.getProfile_image()).into(holder.mImageview);
}
holder.mLinearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: Clicked on FirestoreMemberAdapter ");
Intent intent = new Intent(context, ProfileMemberPage.class);
intent.putExtra(StringCreator.PROJECT_TITLE, projectName);
intent.putExtra(StringCreator.PROJECT_ID, projectId);
intent.putExtra(StringCreator.NAME, model.getName());
intent.putExtra(StringCreator.EMAIL, model.getEmail());
intent.putExtra(StringCreator.USER_ID, model.getUser_id());
intent.putExtra(StringCreator.USER_INFORMATION, model.getUser_information());
context.startActivity(intent);
}
});
}
#NonNull
#Override
public MemberViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_projectmembers, parent, false);
return new MemberViewHolder(view);
}
public class MemberViewHolder extends RecyclerView.ViewHolder {
private LinearLayout mLinearLayout;
private TextView mTextView;
private ImageView mImageview;
public MemberViewHolder(#NonNull View itemView) {
super(itemView);
mTextView = itemView.findViewById(R.id.memberTitle);
mLinearLayout = itemView.findViewById(R.id.layout_members);
mImageview = itemView.findViewById(R.id.memberImage);
}
}
}
Here is the activity in wihch the adapter is used.
projectClicked.java:
//widgets
private RecyclerView recyclerViewMembers;
private TextView projectName;
private Button cameraBtn;
private FloatingActionButton addUserBtn;
//Firebase
private FirebaseFirestore firebaseFirestore = FirebaseFirestore.getInstance();
private Query query;
private FirestoreRecyclerOptions<MemberModel> options;
private FirestoreMemberAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_project_clicked);
projectName = findViewById(R.id.projectName);
addUserBtn = findViewById(R.id.addUserBtn);
cameraBtn = findViewById(R.id.cameraBtn);
initRecyclerView();
addUserBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent newIntent = new Intent(projectClicked.this, UserToProject.class);
Bundle projectBundle = getIntent().getExtras();
if (projectBundle != null) {
newIntent.putExtras(projectBundle);
}
startActivity(newIntent);
}
});
}
private void initRecyclerView() {
Log.d(TAG, "InitRecyclerView: init recyclerview");
if (getIntent().hasExtra(StringCreator.PROJECT_TITLE) && getIntent().hasExtra(StringCreator.PROJECT_ID)) {
final String pName = getIntent().getStringExtra(StringCreator.PROJECT_TITLE);
final String pID = getIntent().getStringExtra(StringCreator.PROJECT_ID);
projectName.setText(pName);
recyclerViewMembers = findViewById(R.id.recyclerView_members);
query = firebaseFirestore.collection("users");
options = new FirestoreRecyclerOptions.Builder<MemberModel>().setQuery(query, MemberModel.class).build();
adapter = new FirestoreMemberAdapter(options, projectClicked.this, pID, pName);
recyclerViewMembers.setHasFixedSize(true);
recyclerViewMembers.setAdapter(adapter);
recyclerViewMembers.setLayoutManager(new LinearLayoutManager(projectClicked.this));
}
}
#Override
public void onStart() {
super.onStart();
adapter.startListening();
}
#Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
Hope this makes sense, please reach out if it doesn't. Thank you in advance.

As #McSlinPlay mentioned, the reason could be pointed out to your code in projectClicked.java where you created your query and all the users (including the test user) are part of this collection:
query = firebaseFirestore.collection("users");

How to retrieve just specific data in Recycler View using Firebase Database?

I have a problem with retrieving specific data from Firebase Realtime Database. My problem is that I want to display in RecyclerView just the materials that has the Course_ID (as you can see in the image below) equals to the Course_ID (see Course -> Teacher-Courses in Firebase). How can I accomplish that thing? I will attach the code used in the RecyclerView and the class that contains the model.
As a mention: 1.I have tried to add all the course id's from Firebase and store them to a List, but the app doesn't show anything and 2. In another class I have an Intent that sends me here and also send a extra String with Course_ID that I have accesed.
I am waiting for your responses. Thank you!
FileMaterial.class
public class FileMaterial {
private String Course_ID;
private String Denumire_material;
private String Locatie_material;
private String Teacher_ID;
public FileMaterial() {
}
public FileMaterial(String course_ID, String denumire_material, String locatie_material, String teacher_ID) {
Course_ID = course_ID;
Denumire_material = denumire_material;
Locatie_material = locatie_material;
Teacher_ID = teacher_ID;
}
public String getCourse_ID() {
return Course_ID;
}
public void setCourse_ID(String course_ID) {
Course_ID = course_ID;
}
public String getDenumire_material() {
return Denumire_material;
}
public void setDenumire_material(String denumire_material) {
Denumire_material = denumire_material;
}
public String getLocatie_material() {
return Locatie_material;
}
public void setLocatie_material(String locatie_material) {
Locatie_material = locatie_material;
}
public String getTeacher_ID() {
return Teacher_ID;
}
public void setTeacher_ID(String teacher_ID) {
Teacher_ID = teacher_ID;
}
CourseMaterial.class
public class CourseMaterial extends AppCompatActivity {
private RecyclerView recyclerView;
private DatabaseReference reference, userReference;
private FirebaseAuth mAuth;
FirebaseRecyclerOptions<FileMaterial> options;
FirebaseRecyclerAdapter<FileMaterial, CourseMaterial.FileViewHolder> adapter;
ImageView btnAddMaterial;
ImageView deleteMaterial;
StorageReference storageReference;
FirebaseStorage firebaseStorage;
String urlReference;
String value;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_material);
value = getIntent().getStringExtra("course id").toString();
mAuth = FirebaseAuth.getInstance();
reference = FirebaseDatabase.getInstance().getReference().child("Materials").child(mAuth.getCurrentUser().getUid());
recyclerView = findViewById(R.id.recyclerView_fileMaterials);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
btnAddMaterial = findViewById(R.id.addMaterials);
btnAddMaterial.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(CourseMaterial.this, UploadFile.class));
}
});
}
#Override
public void onStart() {
super.onStart();
options = new FirebaseRecyclerOptions.Builder<FileMaterial>().setQuery(reference, FileMaterial.class).build();
adapter = new FirebaseRecyclerAdapter<FileMaterial, FileViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull final FileViewHolder fileViewHolder, int i, #NonNull final FileMaterial fileMaterial) {
fileViewHolder.denumire_material.setText(fileMaterial.getDenumire_material());
}
#NonNull
#Override
public FileViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.youtube_view,parent, false);
FileViewHolder fileViewHolder = new FileViewHolder(v);
return fileViewHolder;
}
};
adapter.startListening();
recyclerView.setAdapter(adapter);
}
public static class FileViewHolder extends RecyclerView.ViewHolder{
TextView denumire_material, dataMaterial;
ImageView deleteMaterial;
public FileViewHolder(#NonNull View itemView) {
super(itemView);
denumire_material = itemView.findViewById(R.id.txtDenMaterial);
deleteMaterial = itemView.findViewById(R.id.imgDeleteMaterial);
}
}

Maybe make a query and pass it to the options of the adapter:
#Override
public void onStart() {
super.onStart();
Query query = reference.orderByChild("Course_ID").equalTo(value);
options = new FirebaseRecyclerOptions.Builder<FileMaterial>().setQuery(query, FileMaterial.class).build();
.......
.......
.......

Retrieve Image and name from firebase database in recycler view [duplicate]

everyone, I was trying to make a music app, and for this, I Created a Horizontal RecyclerView in my HomeFragment and my horizontal RecyclerView is getting an image with artist name.
But after clicking I load another Activity. In my other activity, I was trying to load SongsData from firebase in a listView with RecyclerView.
But the problem is I am not getting data from Firebase and it is returning null data. I provided my code below and here is the screenshot of my Firebase database:- ScreenShot
My List Class:-
public class TestUploads
{
private String songName;
private String songImageUri;
private String songUrl;
private String artistName;
public TestUploads() {
}
public String getSongName() {
return songName;
}
public void setSongName(String SongName) {
this.songName = SongName;
}
public String getSongImageUri() {
return songImageUri;
}
public void setSongImageUri(String SongImageUri) {
this.songImageUri = SongImageUri;
}
public String getSongUrl() {
return songUrl;
}
public void setSongUrl(String SongUrl) {
this.songUrl = songUrl;
}
public TestUploads(String SongImageUri, String SongName, String SongUrl ) {
this.songName = SongName;
this.artistName = SongImageUri;
this.songUrl = SongUrl;
}
}
My Adapter Class:-
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.TestViewHolder>{
private Context mContext;
private List<TestUploads> mUploads;
public TestAdapter(Context context , List<TestUploads> uploads) {
mContext = context;
mUploads = uploads;
}
#NonNull
#Override
public TestViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.test_package_layout , parent ,false);
return new TestViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull TestViewHolder holder, int position) {
TestUploads uploadcurrent = mUploads.get(position);
holder.name.setText(uploadcurrent.getSongName());
Glide.with(mContext)
.load(uploadcurrent.getSongImageUri())
.into(holder.image_view);
}
#Override
public int getItemCount() {
return mUploads
.size();
}
public class TestViewHolder extends RecyclerView.ViewHolder {
public TextView name;
public TextView artist_name;
public CircleImageView image_view;
public TestViewHolder(#NonNull View itemView) {
super(itemView);
name = itemView.findViewById(R.id.test_package_song_name);
artist_name = itemView.findViewById(R.id.test_package_artist_name);
image_view = itemView.findViewById(R.id.test_package_image_name);
}
}
}
My Activity:-
public class TestActivity extends AppCompatActivity {
private ValueEventListener listener;
private DatabaseReference reference;
private List<TestUploads> mUploads;
private RecyclerView mRecyclerView;
private TestAdapter adapter;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_package_activity);
reference = FirebaseDatabase.getInstance().getReference("ArtistView").child(getIntent().getStringExtra("Artist"))
.child("Songs");
Toast.makeText(this, "" + getIntent().getStringExtra("Artist"), Toast.LENGTH_SHORT).show();
mUploads = new ArrayList<>();
mRecyclerView = findViewById(R.id.test_pacakge_recyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.smoothScrollToPosition(0);
adapter = new TestAdapter(this , mUploads);
mRecyclerView.setAdapter(adapter);
listener = reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
mUploads.clear();
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
TestUploads uploads =postSnapshot.getValue(TestUploads.class);
mUploads.add(uploads);
}
adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
}
Sorry for so much code but this is not hard to solve. If you find the solution please reply to me. Thanks for reading this.

The problem in your code lies in the fact that the names of the fields in your TestUploads class are different than the name of the properties in your database. You have in your TestUploads class a field named songName but in your database, I see it as SongName and this is not correct. The names must match. When you are using a getter named getSongName(), Firebase is looking in the database for a field named songName and not SongName. See the lowercase s letter vs. capital letter S?
There are two ways in which you can solve this problem. The first one would be to remove the data in your database and add it again using field names that start with lowercase, as exist in your TestUploads class.
If you are not allowed to use the first solution, then the second approach will be to use annotations. So you should use the PropertyName annotation in front of the getters. So in your TestUploads class, a getter should look like this:
#PropertyName("SongName")
public String getSongName() {
return songName;
}

Arrange by price from Firebase (Android)

My goal is to arrange my products by price, wherein the lowest price would be on top. Currently, the products are being arranged according to its create date. How do I achieve my goal? Thanks in advance.
SampleActivity.java
public class SampleActivity extends AppCompatActivity {
private RecyclerView rec;
private DatabaseReference dref;
private Query dref2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample);
rec = (RecyclerView) findViewById(R.id.rec);
rec.setHasFixedSize(true);
rec.setLayoutManager(new LinearLayoutManager(this));
String vegmeat_type = getIntent().getExtras().get("vegmeat_type").toString();
dref = FirebaseDatabase.getInstance().getReference().child("Products");
dref2 = dref.orderByChild("name").startAt(vegmeat_type).endAt(vegmeat_type);
}
public static class FeedViewHolder extends RecyclerView.ViewHolder{
View mView;
public FeedViewHolder(View itemView){
super(itemView);
mView = itemView;
}
public void setPrice(String Price){
TextView price = (TextView) mView.findViewById(R.id.TVPrice);
price.setText(Price);
}
public void setStallname(String StallName){
TextView stallname = (TextView) mView.findViewById(R.id.TVStallName);
stallname.setText(StallName);
}
}
protected void onStart() {
super.onStart();
FirebaseRecyclerAdapter<prive, FeedViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<prive, FeedViewHolder>(
prive.class,
R.layout.row,
FeedViewHolder.class,
dref2
) {
#Override
protected void populateViewHolder(FeedViewHolder viewHolder, prive model, int position) {
viewHolder.setPrice(model.getPrice());
viewHolder.setStallname(model.getStallname());
}
};
rec.setAdapter(firebaseRecyclerAdapter);
}
}
Here's a screenshot from my database

You can use something like this:
angularFireDB: AngularFireDatabase;
yourProducts: AngularFireList<any>;
orderedProducts: Observable<any[]>;
this.yourProducts = this.angularFireDB.list('/products');
this.orderedProducts = this.yourProducts.valueChanges().map(res => res.sort((a, b) => a.price < b.price ? -1 : 1));
You need to use AngularFireDatabase class to get your database data.

You need to do the following:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference();
ref.child("Products").orderByChild("price");
more info here:
https://firebase.google.com/docs/database/android/lists-of-data#data-order

How to chain queries in firebase android?

I want to get all the missions for a specific user (constraint num 1),
but only the available users (constraint num 2).
I know I can overcome one constraint by 'order by' and 'equalTo' functions,
but i'm failing at overcoming the second one.
This is my firebase db:
This is my current result at the app (A finished mission is there! I don't want it!):
This is my relevant code:
public class PendingFragmentUser extends Fragment {
private String TAG = "dDEBUG";
private RecyclerView mPendingList;
private DatabaseReference mMissionsDb;
private FirebaseAuth mAuth;
private String mCurrent_user_id;
private View mMainView;
Query queries;
public PendingFragmentUser() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mMainView = inflater.inflate(R.layout.fragment_pending_user, container, false);
mPendingList = (RecyclerView)mMainView.findViewById(R.id.pending_recycler_user);
mAuth = FirebaseAuth.getInstance();
mCurrent_user_id = mAuth.getCurrentUser().getUid();
mMissionsDb = FirebaseDatabase.getInstance().getReference().child("Missions");
queries = mMissionsDb.orderByChild("user_uid").equalTo(mCurrent_user_id);
mMissionsDb.keepSynced(true);
mPendingList.setHasFixedSize(true);
mPendingList.setLayoutManager(new LinearLayoutManager(getContext()));
// Inflate the layout for this fragment
return mMainView;
}
#Override
public void onStart() {
super.onStart();
final FirebaseRecyclerAdapter<Mission, PendingFragmentUser.MissionsViewHolder> firebaseMissionsUserRecyclerAdapter = new FirebaseRecyclerAdapter<Mission, PendingFragmentUser.MissionsViewHolder>(
Mission.class,
R.layout.missions_single_layout,
PendingFragmentUser.MissionsViewHolder.class,
queries
) {
#Override
protected void populateViewHolder(PendingFragmentUser.MissionsViewHolder missionViewHolder, final Mission missionModel, final int missionPosition) {
// Log.d(TAG, "inside populateViewHolder" + missionModel.getType() + " , " + missionModel.getDescription());
missionViewHolder.setMissionName(missionModel.getType());
missionViewHolder.setMissionDescription(missionModel.getDescription());
missionViewHolder.setMissionStatus(missionModel.getStatus());
}
};
mPendingList.setAdapter(firebaseMissionsUserRecyclerAdapter);
}
public static class MissionsViewHolder extends RecyclerView.ViewHolder {
View mView;
Button button ;
public MissionsViewHolder(View itemView) {
super(itemView);
mView = itemView;
button = (Button)mView.findViewById(R.id.pending_single_button);
}
public void setMissionName(String name){
TextView mMissionNameView = mView.findViewById(R.id.mission_single_name);
mMissionNameView.setText(name);
}
public void setMissionStatus(String status){
TextView mMissionStatusView = mView.findViewById(R.id.mission_single_status);
mMissionStatusView.setText(status);
if (status.equals("Available")){
mMissionStatusView.setTextColor(Color.parseColor("#008000"));;
} else {
mMissionStatusView.setTextColor(Color.parseColor("#FF0000"));;
}
}
public void setMissionDescription(String description){
TextView mMissionDescriptionView = mView.findViewById(R.id.mission_single_description);
mMissionDescriptionView.setText(description);
}
}
}
How can I overcome this firebase limitations?
To filter all missions for specific user:
queries = mMissionsDb.orderByChild("user_uid").equalTo(mCurrent_user_id);
And now I would like to do:
queries = mMissionsDb.orderByChild("user_uid").equalTo(mCurrent_user_id).orderByChild("status").equalTo("Available");
But it's not possible in firebase.
In addition, I have to use real-time adapter because it's critical the my UI shows exactly the DB with minimum delay in changes at the DB. Thanks